Purple Durple recommended it and it was AWESOME! My cold pressures were 25psi and they pretty much looked flat but the grip was outstanding and consistent from start to finish. Warm up lap? Don't need it. Greasy? Never.

My observations.

1. When there was a full course black/yellow, I came in the pits for 4 minutes. Went back out and they were terrible for the rest of the session. Not sure why but they were great the next session.

2. I have 2 massive chunks missing, down to the cords. I'm sure it happened this past weekend. I think the lower pressures make them more suspectible to chunking if you catch a curb (I did).

3. First time I had to add air after sessions to get the pressures up to 35psi hot in the morning.

4. You need MORE camber. I had -2.5fr and -1.35rr and I murdered the outsides.

Ran 3 track days and I think I have a couple more days left. An E90 M3 track buddy with similar setup as mine (quoting him) did 4 or 5 days on his recently.

But yeah, I'm sure the stickiness with lower PSI comes with a shorter tread life trade-off, albeit 1 day difference?

One track I run at is pretty dirty. The guy at www.performancetread.com says you're more likely to damage the tires running lower pressures from crap on the track. Which is what happened to two of my NT01s.

I've always done it this way, do a session, check the pressures, make sure they are around 34 hot. Also depends on the tyre. My dunlops are fine at 34, a friend had yokohama R spec tyres and he needed to go a bit higher, was getting bad wear / feathering on the fronts. Increased the pressure and it was fine.